Improvement in screw-drivers



T. I. SLOAN.

SCREW-DRIVER.

Patented $212.8, 1876.

N- PETERS. FHOT UNITED STATES PATENT OFFICE.

THOMAS J. SLOAN,.OF NEW YORK, N. Y.

IMPROVEMENT lN SCREW-DRIVERS.

Specification forming part of Letters Patent No. 173,356, dated February8, 1876; application filed January 22, 1876.

To an whom it may concern Be it known that I, THOMAS J. SLOAN, of thecity, county, and State of New York, have invented an Improvement inScrew-Drivers, of which'the following is'a specification: This inventionis designed for driving that variety of wood-screws in which the nick orgroove in the head slopes laterally from the center of the head, and isdeepest at the edges of the latter; the object of my said inventionbeing to provide a driver whereby such screws may be driven with theirheads flush with the surface of the material into which they arescrewed, without that danger of tearing and disfiguring such materialinevitably involved in the driving of such screws bya driver of adequateWidth made after any of the plans hitherto in use.

My said invention consists in an angularlynotched'screw-driver, in whichthe corners of the driving edge are beveled ofi at an angle more or lesscoincident with the taper of the head of the screw to lie driven,whereby the driver is enabled to hold in the groove throughout theentire length thereof without projectingbeyoud the sides of the head,and thereby has the most effective hold upon the screw, withoutliability of laceratin g the material into which it is forced, even whenthe head is driven home flush with the surface of said material.

Figure 1 is a side view of a screw-driver made according to myinvention, and Fig. 2

indicates the variety of wood-screws with which it is intended to beused.

The blade A of the driver is attached to the handle B, in the usual orany suitable man ner. In the end of the blade A is formed an angularnotch, a, and from the outer corners d of this notch the corners of thedriver itself are beveled otf, as shown at a c.

The screw shown in Fig. 2 has its nick or groove 6 deepening from apoint, a", central to the head, laterally to the edges or sides 0 of thesaid head.

When the driver is applied to the head of the screw to drive the saidscrew, the angular notch a fits upon the central portion 11 of the saidhead, with the projecting portions b of the driver situate in theoppositely-sloping portions of the nick or groove 0, and the beveledcorners ofthe driver flush, or nearly so,

with the adjacent surface f! of the head.

It will be seen from this that, while the driver is enabled to take thefirmest possible hold upon the head, (being fitted into the whole of thegroove or nick thereof,) no portion is permitted to project beyond thecircum ference thereof, and all tearing of the material into which thescrewis driven, even when the head of the latter is brought flush oreven with the surface of said material.

What I claim as my invention is- The angularly-notched screw-driver,constructed with the beveled corners a. 0, substantially as and for thepurpose set forth.

7 THOS. J. SLOAN. Witnesses: H. WELLs, J r.,

I ERNST BILHUBER.

